OF PHILADELPHIA. 251 



Length of the body half an inch. 



This species equals (J. Geoffroyi Leach, in length, but is less 

 robust. 



2. C. ALTERNATA. — With black and pale transverse lineations; 

 face and feet pale whitish ; beneath black. 



Inhabits Missouri. 



Head pale greenish-white : eyes triangular, large, reddish- 

 brown, dark : thorax black, with about eight transverse, pale, 

 equal lines : elytra with very numerous, alternate, interrupted, 

 black and pale yellowish lines, which become more irregular and 

 undulated towards the tip : wings white : epipleura pale, imma- 

 culate, edge blackish : feet whitish : pectus and postpectus black : 

 tergum black, with a white margin : venter black, with a pale 

 margin and terminal incisures. 



Length a quarter of an inch. [330] 



Very much resembles the preceding, but is much smaller, 

 darker, and the prevailing color beneath is black. 



CICADA Oliv. Latr. 



1. C. PRUINOSA. — Body above varied with greenish and black, 

 beneath pruinose : abdomen with a white spot each side, at base, 

 one at the middle margin and another near the marginal tip. 



Inhabits the United States. 



Wings, nervures of the hemelytra green to the middle, inner 

 edge of the costal nervure brownish, nervures beyond the middle 

 brownish : anterior thighs varied with dusky ; anterior pairs of 

 legs dusky at the exterior tip : tarsi varied with dusky : tergum 

 black : segments destitute of differently colored posterior margins, 

 basal segment with a white pruinose spot each side of the back, 

 another transversely elongated and attenuated one on the lateral 

 base of the third segment, and another upon the lateral base of 

 the caudal segment : venter dusky in the middle : caudal seg- 

 ments beneath testaceous, dusky near the middle tip. 



Length two inches, to the tip of the hemelytra. 



Found on the Missouri ; it is also very common in Pennsyl- 

 vania, and much resembles C. tihicen of Fabr., but it differs in 

 being pruinose beneath, and in having white abdominal spots. 



2. C. MARGINATA. — Body above varied with [331] greenish 

 1825.] 



